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'(NModeL) M. D. ANDRUS.

SEWING MACHINE SHUTTLE,

' Patented May 23, 1882.

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UNITED STATES PATENT OFFIcE.

MARSHALL D. ANDRUS, OF MIDDLETOWN, CONNECTICUT, ASSIGNOR TO THE VICTOR SEWING MACHINE COMPANY, OF SAME PLACE.

SEWING-MACHINE SHUTTLE.

I SPECIFICATION forming part of Letters Patent No. 258,346, dated May 23, 1882,

Application filed March 31, 1882. (No model.)

T all whom it may concern Be it known that I, MARSHALL D. ANDRUS, a citizen of the United States, residing at Middletown, in the county of Middlesex and State of Connecticut, have invented new and useful Improvements in Sewing-Machine Shuttles, of which the following is a specification.

One of the difficulties attending the use of the ordinary sewing-machine shuttle was that after the requirement for the delivery of thread from the bobbin had ceased the bobbin would by reason of its momentum continue its rotation for a short time, thereby slackening up the thread between the bobbin and the threadpassage through the shuttle-case, and allowing the slackened thread to slip over the end of the bobbin and become caught and entangled about its journal. Hence in starting the machine the thread was liable to be broken. To obviate such difficulty a spring brake or tension device has been arranged to impinge upon the bobbin or one of its journals, in order to cause the bobbin to cease its revolution as soon as the machine has been stopped; but such device is objectionable, since it will inevitably interfere with the free rotation of the bobbin and the easy delivery of the thread therefrom.

It is the object of this invention to obviate all of these objectionable features, and to pro-- vide means which shall prevent the thread from slipping over the ends of the bobbin and catchin g or becoming entangled about the bobbinjournals, and which at the same time shall not in any Wise interfere with the free rotation of the bobbin. To such end I provide at the heel of the bobbin a concave or cup-shaped guard adapted to receive one of the flanged ends of the bobbin, and having acentrally-located step for the bobbin-journal, and upon a pivoted gate or arm which closes down over the bobbinjournal at the point of the shuttle I provide a curved guard adapted to cover the upper exposed portion of the flange at this end of the bobbin.

In the drawings, Figure 1 is a perspective view of a sewing-machine shuttle provided with my improvement. Fig. 2 is a longitudinal central section. Fig. 3 is a transverse seea transverse section taken on the line 4 4 of Fig. 2.

A indicates the shuttle-case, and B the bobbin, which is flanged at its ends and provided with journals, as usual. i

The concave or cup-shaped guard C, located within the shuttle-case at the heel end and rigid with the same, receives one of the flanged ends of the bobbin, and in the center of the said guard is formed a. step or recess, 0, in which thejournal at this end of the bobbin is received. The opposite solid end or point aof the shuttlecase is formed with a longitudinal channel or recess, D, having at its lowest extremity a hearing, (I, for one of the journals of the bobbin, said recess admitting ofthe removal 6 of the bobbin from the shuttle-case when it becomes neeessary to refill the bobbin.

The arm or gate E employed for locking the bobbin in the shuttle-case is pivoted to one of the sides of the latter, and formedl at its free end with two angular bends. The part c, bent at right angles to the main portion ofthe gate, enters a slot, F, when the gate is closed. said slot being formed near the shuttle-point. The end 0 of the gate, which by reason of the second bend is coincident with the line of the main body of the gate or arm, enters the recess D, and hence, closing over the bobbinjourual, holdsthelatter within the shuttle-ease.

F indicates the curved guard, which is rigid with the bent end of the gate. This guard, when the gate is closed, covers the flange of the bobbin at this end of the shuttle, and subserves the same purpose as the concave guard at the heel end of the shuttle. It will be seen by this arrangement that these guards do not bear upon the bobbin so as to retard the rotation of the same, while at the same time their inner curved faces will be in close proximity to the flanged ends of the bobbin, and thereby 9o prevent the thread from slippiu g over the end of the bobbin should slack in the thread occur between the bobbin and the point where the thread passes out through the shuttle-case.

It will be obvious thatin place of the concave 5 guard a thin curved plate could be attached to the shuttle-case, although the concaved guard tion taken on the line 3 3,.Fig. 2. Fig. 4. is I herein shown is the approved form. Where such curved plate is employed it will be rigid with the shuttle-ease at the heel of the latter, and be adapted to extend over a portion of the flanged end ofthe bobbin, thus forming a shieldguard like the concave already described, that will prevent the thread from slipping over the said end of the bobbin.

What I claim is- 1. A sewing-machine shuttle provided with a guard that is rigid with the shuttle-case, the said guard being formed with a curved wall located over and in close proximity to the flanged end of the bobbin, but not touching the same, whereby the thread will be prevented from slipping over the said end of the bobbin, substantially as described.

2. A sewing-machine shuttle provided with a concaved guard rigid with the shuttle-case and adapted to prevent the thread from slippingover the end 'otthe bobbin, the said guard having a centrally-located step for the bobbinjournal, and the flanged end of the bobbin at the heel of the shuttle being received in the concavity ol the guard, substantially as described.

3. The combination, in a sewing-machine shuttle, of the gate E, provided at its free end with a curved guard adapted to close over the flanged end of the bobbin at the point of the shuttle and to prevent the thread from slipping oh the end of the bobbin, substantially as described.

4. The combination, with the shuttle-case, of concaved guard O at the heel of the shuttle and the curved guard F upon the pivoted shuttle-gate, substantially as described.

In testimony whereofl have hereunto set my hand in the presence of two subscribing witnesses.

MARSHALL D. ANDRUS.

Witnesses- Gno. M. PRATT, W. L. BLAKE. 

